Sending-end bipolar converter control method and device and computer readable storage medium

Abstract

The invention belongs to the technical field of flexible direct-current power transmission, and particularly relates to a sending-end bipolar converter control method and device and a computer readable storage medium. When the power requirements of receiving end power grids connected with receiving end current converters of two flexible direct current transmission poles are inconsistent and only one pole of receiving end power grid has a clear active power requirement, a control device of a sending end current converter of a pole where the receiving end current converter connected with the receiving end power grid with the clear active power requirement is located adopts PI control to calculate a frequency difference value; the control device of the transmitting-end converter of the other pole adopts active power-alternating current frequency droop control to realize active power differential control of the two-pole converter, so that the active power of the transmitting-end two-pole converter is distributed as required according to the active power requirement of the receiving-end power grid; flexible configuration of new energy active power is realized, a new energy station is prevented from being urgently cut off, and the effective utilization rate of new energy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible direct current transmission, and in particular relates to a sending-end bipolar converter control method, device and computer-readable storage medium. Background Art

[0002] In flexible DC transmission projects, in order to improve the capacity and quality of power transmission, the converter station uses multiple converters for control to transmit renewable energy to the receiving AC grid. The document "Control Strategy of Bipolar Flexible DC Converter Station Connected to Isolated Island Renewable Energy Field" proposes a method for coordinated control of AC voltage and frequency droop (abbreviated as dual U / f droop control) of bipolar converter units. Figure 1 As shown, it includes three parts: a reference phase generator, an outer loop controller, and an inner loop current controller. The converters all adopt reactive power / AC voltage (Q / U) droop control to adjust the voltage amplitude balance of the dual converter AC bus. The dual converters all adopt active power / AC frequency (P / f) droop control to adjust the phase synchronization of the AC bus voltage of the dual converter, so as to achieve the average distribution of bipolar active power. However, when the two converters in the receiving-end converter station are respectively connected to different receiving-end AC power grids, when the control is performed according to the above converter control method, if the active power requirements of the receiving-end AC power grid are not the same, in order to meet the requirements of the receiving-end AC power grid with lower active power, the active power of the other converter has to be reduced to ensure the balance of the active power of the bipolar converter, resulting in the urgent need for new energy stations, reducing the effective utilization rate of new energy, and making the flexible DC transmission system lack the ability to flexibly adjust active power, and unable to meet the differentiated active power requirements of different AC power grids in different AC power grid scenarios when the bipolar converters of the receiving-end converter station are connected. Summary of the invention

[0003] The purpose of the present invention is to provide a sending-end bipolar converter control method, device and computer-readable storage medium to solve the problem that when the bipolar converters of the receiving-end converter station are connected to different AC power grids respectively, the effective utilization rate of new energy is low and the differentiated needs of AC active power cannot be met.

[0004] In order to solve the above technical problems, the present invention provides a sending-end bipolar converter control method, comprising:

[0005] The frequency difference of the control system is obtained according to the active power command value of the converter and the actual value of the AC active power of the converter, and the phase angle of the converter is calculated based on the frequency difference and the reference frequency; wherein, when the active power demands of the receiving-end power grids to which the converters at the two poles of the receiving end are connected are inconsistent and only one pole of the receiving-end power grid has a clear active power demand, the sending-end converter at the pole where the receiving-end converter connected to the receiving-end power grid with a clear active power demand is located adopts PI control to calculate the frequency difference, and the sending-end converter at the other pole adopts active power-AC frequency droop control to calculate the frequency difference;

[0006] The three-phase voltage command value of the sending-end converter is calculated according to the d-axis component current command value, the q-axis component current command value and the phase angle of the converter, and the sending-end converter is controlled according to the three-phase voltage command value of the converter.

[0007] Furthermore, when the active power requirements of the receiving-end power grids to which the converters at the two poles of the receiving end are connected are consistent, the converters at the two poles of the sending end both use active power-AC frequency droop control to calculate the frequency difference.

[0008] Furthermore, the switching control method is used to control the converters at the sending ends of each pole to adopt PI control or active power-AC frequency droop control to calculate the frequency difference.

[0009] Furthermore, the method for generating the d-axis component current command value is: first, the reactive power differential adjustment amount of the converter is calculated according to the difference in actual reactive power values ​​between the converter and other converters connected in parallel with the same pole in the sending-end converter station, and the difference in actual reactive power values ​​between the two poles in the sending-end converter station, and then the reactive power differential adjustment amount is superimposed with the AC bus voltage command value and the d-axis component of the actual value of the AC bus voltage is subtracted, and then the output value of the difference between the converter reactive power command value and the actual reactive power value after reactive power droop control is superimposed, and then the d-axis component current command value is obtained through PI control.

[0010] Furthermore, the calculation method of the reactive power differential adjustment amount of the converter is as follows: according to the difference in actual reactive power values ​​between the two poles in the converter station where the converter is located and the number of converters in the pole where the converter is located, the first adjustment amount evenly distributed for the converter is calculated; the sum of the differences in actual reactive power values ​​between the converter and other converters connected in parallel with the same pole is calculated as the second adjustment amount; the first adjustment amount and the second adjustment amount are superimposed to obtain the reactive power difference of the converter; and the reactive power differential adjustment amount of the converter is obtained according to the reactive power difference of the converter and the reactive power differential adjustment coefficient.

[0011] Furthermore, the calculation formula of the reactive power differential regulation of the converter is:

[0012]

[0013] Among them, ΔQ is the reactive power differential regulation of this converter, k0 is the reactive power differential regulation coefficient, m is the number of converters in the pole where this converter is located, n is the number of converters in another pole, Q i is the actual reactive power value of the ith converter in the pole where the converter is located, Q opj is the actual reactive power value of the jth converter in the other pole, q iis the difference in actual reactive power between this converter and the other i-th converter connected in parallel with the same pole.

[0014] The beneficial effects of the above technical solution are as follows: the present invention is an improved invention. When the active power demands of the receiving-end power grids connected to the receiving-end converters at the two poles of flexible direct current transmission are inconsistent and only one receiving-end power grid has a clear active power demand, the sending-end converter of the pole where the receiving-end converter connected to the receiving-end power grid with a clear active power demand is located adopts PI control to calculate the frequency difference, accurately controls the active power of the pole, and the sending-end converter of the other pole adopts active power-AC frequency droop control to achieve differentiated active power control of the two-pole converters, so that the active power of the two-pole converters at the sending end is allocated on demand according to the active power demand of the receiving-end power grid, thereby improving the flexible configuration of the active power of new energy, avoiding the emergency of new energy stations, and improving the effective utilization rate of new energy.

[0015] To solve the above technical problems, the present invention also provides a sending-end bipolar converter control device, comprising a processor, wherein the processor is used to execute computer instructions to control the sending-end converter according to the sending-end bipolar converter control method as described above.

[0016] Furthermore, the converter control devices transmit information to each other using optical fiber communication.

[0017] The beneficial effects of the above technical solution are as follows: the present invention is an improved invention. When the active power demands of the receiving-end power grids connected to the receiving-end converters at the two poles of the flexible direct current transmission are inconsistent and only one of the receiving-end power grids has a clear active power demand, the control device of the sending-end converter at the pole where the receiving-end converter connected to the receiving-end power grid with a clear active power demand is located adopts PI control to calculate the frequency difference, accurately controls the active power of the pole, and the control device of the sending-end converter at the other pole adopts active power-AC frequency droop control to achieve differentiated active power control of the two-pole converters, so that the active power of the two-pole converters at the sending end is allocated on demand according to the active power demand of the receiving-end power grid, thereby improving the flexible configuration of the active power of new energy, avoiding the emergency of new energy stations, and improving the effective utilization rate of new energy.

[0018] In order to solve the above technical problems, the present invention also provides a computer-readable storage medium, in which computer-executable instructions are stored. The computer-executable instructions are used to implement the above-mentioned sending-end bipolar converter control method when executed.

[0019] The beneficial effects of the above technical solution are as follows: the present invention is an improved invention. When the active power demands of the receiving-end power grids connected to the receiving-end converters at the two poles of flexible direct current transmission are inconsistent and only one receiving-end power grid has a clear active power demand, the sending-end converter of the pole where the receiving-end converter connected to the receiving-end power grid with a clear active power demand is located adopts PI control to calculate the frequency difference, accurately controls the active power of the pole, and the sending-end converter of the other pole adopts active power-AC frequency droop control to achieve differentiated active power control of the two-pole converters, so that the active power of the two-pole converters at the sending end is allocated on demand according to the active power demand of the receiving-end power grid, thereby improving the flexible configuration of the active power of new energy, avoiding the emergency of new energy stations, and improving the effective utilization rate of new energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a block diagram of U / f droop control of dual converter in the prior art;

[0021] Figure 2 is a topological block diagram of a flexible direct current transmission system according to an embodiment of the method of the present invention;

[0022] Figure 3 is a reference phase generator switching logic block diagram of an embodiment of the method of the present invention;

[0023] Figure 4 It is a control block diagram of a sending-end bipolar converter with reactive power differential regulation introduced in an embodiment of the method of the present invention;

[0024] Figure 5 It is a control waveform diagram of a sending-end bipolar active power system according to an embodiment of the method of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings.

[0026] For the scenario where the converters of the two poles of the receiving-end converter station are connected to different AC power grids respectively, when the active power demands of the receiving-end power grids connected to the receiving-end converters at the two poles of the flexible DC transmission are inconsistent and only one pole of the receiving-end power grid has a clear active power demand, the sending-end converter of the pole where the receiving-end converter connected to the receiving-end power grid with a clear active power demand is located adopts PI control to calculate the frequency difference, and accurately controls the active power of the pole. The sending-end converter of the other pole adopts active power-AC frequency droop control to achieve differentiated active power control of the two-pole converters, so that the active power of the two-pole converters at the sending end is allocated on demand according to the active power demand of the receiving-end power grid, thereby improving the flexible configuration of the active power of new energy, avoiding the emergency of new energy stations, and improving the effective utilization rate of new energy.

[0027] Method Embodiment

[0028] The sending-end bipolar converter control method of the present invention is applicable to the scenario where the bipolar converters of the receiving-end converter station are connected to different AC power grids respectively, and meets the differentiated active power requirements of the bipolar converters of the receiving-end converter station being connected to different AC power grids respectively. Figure 2 As shown in the figure, taking the example of connecting one converter to each pole of the sending-end converter station, multiple new energy stations at the sending end are connected to the AC bus of the sending-end converter station at a voltage level of 66kV. The two converters WFMMC1 and WFMMC2 of the sending-end converter station are connected in parallel to the same AC bus, corresponding to pole 1 and pole 2 respectively. The corresponding converters GSMMC1 and GSMMC2 of the receiving-end converter station are connected through the pole 1 (such as positive pole) line and the pole 2 (such as negative pole) line, as well as the metal return line. The converters GSMMC1 and GSMMC2 are connected to different AC power grids respectively. The pole 1 and pole 2 converter control devices control the sending-end converters respectively. The two use fast optical fiber communication. The communication protocol can adopt IEC 60044-8, IEEE 802.3 1000Base, Aurora, etc. The transmission rate is generally not less than 20Mbps, which is used to transmit the reactive power of the converter and the main pole control instructions to each other. The converter at the sending-end converter station controls the AC voltage and frequency, providing grid-connected AC voltage for the sending-end renewable energy. The converter at the receiving-end converter station controls the DC voltage, providing stable DC voltage for the flexible DC transmission system.

[0029] The control method of the sending-end bipolar converter of the present invention comprises three parts: a reference phase generator, an outer loop controller and an inner loop current controller. The reference phase generator is used to generate the phase angle of the converter, the outer loop controller is used to generate the d-axis component current command value and the q-axis component current command value, and the inner loop current controller is used to calculate the three-phase voltage command value of the sending-end converter according to the d-axis component current command value, the q-axis component current command value and the phase angle of the converter, which is described in detail below.

[0030] 1. Reference phase generator

[0031] The reference phase generator is used to obtain the frequency difference of the control system according to the active power command value of the converter and the actual value of the AC active power of the converter, and calculate the phase angle of the converter based on the frequency difference and the reference frequency. When the active power requirements of the receiving-end grid 1 and the receiving-end grid 2 connected to the receiving-end converters GSMMC1 and GSMMC2 are inconsistent and only one of the receiving-end grids has a clear active power requirement, in order to maximize the use of the power transmitted by the new energy station, the sending-end converter of the pole where the receiving-end converter connected to the receiving-end grid with a clear active power requirement is located adopts PI control to calculate the frequency difference, and the sending-end converter of the other pole adopts active power-AC frequency (Pf) droop control to calculate the frequency difference, and the control system frequency difference output is superimposed on the reference frequency f0, and then realized through the integral link to cycle between 0 and 2π, and finally output the phase angle of the converter. When the active power requirements of the receiving-end grids connected to the converters at the two poles of the receiving end are consistent, the converters at the two poles of the sending end use active power-AC frequency droop control to calculate the frequency difference.

[0032] PI control uses a P / F differenceless PI controller, and the calculation formula is:

[0033]

[0034] Where △f represents the frequency difference of the control system, in Hz; P ref represents the active power command value of the converter, P represents the actual value of the AC active power of the converter, in MW; kp3 represents the proportional coefficient of the PI controller, ki3 represents the integral coefficient of the PI controller, dimensionless; t represents time.

[0035] P / f droop control uses a P / f droop controller as:

[0036] △f=k pf (P ref -P)

[0037] Among them, k pf Indicates the droop coefficient of the P / F droop controller in Hz / MW.

[0038] As a preferred embodiment, Figure 3 As shown in the figure, the reference phase generator of the two-pole converter of the sending-end converter station in the engineering application adopts bipolar coordinated control to enable, and the switching control is performed according to whether the active power demand of the AC power grid connected to the receiving-end power grid is the same. When the power dispatching department clearly defines the active power demand of the receiving-end power grid 1, the operator issues an instruction to switch pole 1 to the dominant pole, and pole 2 is forced to be the non-dominant pole. When pole 1 is determined to be the dominant pole, the bipolar coordinated control is triggered to switch the reference phase generator of the pole 1 converter from Pf droop control to Pf differenceless PI control, and the reference phase generator of the non-dominant pole 2 converter still adopts Pf droop control.

[0039] 2. Outer loop controller

[0040] The d-axis control link of the outer loop controller adopts the AC voltage mode, which can be used as follows Figure 1 The outer loop controller shown in the figure is used for control. Since the primary equipment and secondary equipment involved in the converter control loop have certain differences, the reactive power of each converter may be inconsistent, which in turn leads to a large reactive power circulation between the two poles of the converter station, causing the reactive power of the converter to exceed the limit, affecting the stable operation of the system. Therefore, the present invention first calculates the reactive power differential adjustment amount of the converter according to the difference in actual reactive power values ​​between the converter and other converters connected in parallel with the same pole in the sending-end converter station and the difference in actual reactive power values ​​between the two poles in the sending-end converter station, and then subtracts the d-axis component of the reactive power differential adjustment amount from the AC bus voltage command value after superposition and the actual value of the AC bus voltage, and then superimposes the output value of the difference between the converter reactive power command value and the actual value of reactive power after reactive power droop control, and then obtains the d-axis component current command value of the current inner loop controller through PI control.

[0041] Specifically, the first adjustment amount evenly distributed by the converter is calculated according to the difference in actual reactive power values ​​between the two poles in the converter station where the converter is located and the number of converters in the pole where the converter is located, and the sum of the differences in actual reactive power values ​​between the converter and other converters connected in parallel with the same pole is calculated as the second adjustment amount. The reactive power difference of the converter is obtained by superimposing the first adjustment amount and the second adjustment amount. The reactive power difference adjustment amount of the converter is obtained according to the reactive power difference of the converter and the reactive power difference adjustment coefficient. The calculation formula is:

[0042]

[0043] Among them, ΔQ is the reactive power differential regulation of this converter, k0 is the reactive power differential regulation coefficient, m is the number of converters in the pole where this converter is located, n is the number of converters in another pole, Q i is the actual reactive power value of the ith converter in the pole where the converter is located, Q opj is the actual reactive power value of the jth converter in the other pole, q i is the difference in actual reactive power between this converter and the other i-th converter connected in parallel with the same pole.

[0044] like Figure 4 As shown, the calculation formula of the d-axis component current command value is as follows:

[0045]

[0046] Among them, i drefIndicates the current d-axis component command value of the current inner loop controller, in kA; U sref Indicates the AC bus voltage command value, U d It represents the d-axis component of the actual value of the AC bus voltage after Parker transformation, in kV; Q represents the actual value of the reactive power of the converter, Q ref Indicates the reactive power command value of the converter, in Mvar; k qv Indicates reactive power droop control coefficient, unit is kV / Mvar; kp d Indicates the proportional coefficient of the PI control link of the outer ring d-axis controller, ki d It represents the integral coefficient of the PI control link of the outer ring d-axis controller, dimensionless; t is time. Among them, U sref , k0, k qv 、kp d ,ki d Keep the parameters consistent.

[0047] When a converter is provided for each pole of the sending-end converter, the calculation formula of the d-axis component current command value is:

[0048]

[0049] Among them, Q represents the actual reactive power value of the local converter, Q op It indicates the actual reactive power value of the pole-to-pole converter in Mvar.

[0050] The q-axis control link of the outer loop controller suppresses the negative sequence current during AC unbalanced fault by controlling the q-axis component of the AC bus voltage after Park transformation to 0. The calculation formula is as follows:

[0051]

[0052] Among them, i qref Indicates the current q-axis component command value of the current inner loop controller, in kA; U q It represents the q-axis component of the actual value of the AC bus voltage after Park transformation, in kV; kp q represents the proportional coefficient of the PI control link of the outer loop q-axis controller, ki q represents the integral coefficient of the PI control link of the outer loop q-axis controller, dimensionless. Among them, kp of the sending end two-pole converter q ,ki q Keep the parameters consistent.

[0053] 3. Inner loop current controller

[0054] The d-axis control link of the inner loop current controller is decoupled and controlled, and the d-axis component of the voltage command value of the sending-end converter is obtained based on the d-axis component of the actual value of the AC bus voltage, the q-axis component and the d-axis component of the AC current flowing into the converter. The calculation formula is as follows:

[0055]

[0056] Among them, v d Represents the d-axis component of the converter voltage command value, in kV; i d represents the d-axis component of the AC current flowing into the sending-end converter, i q It represents the q-axis component of the AC current flowing into the sending-end converter, in kA; kp1 represents the proportional coefficient of the PI control link of the inner loop current d-axis controller, ki1 represents the integral coefficient of the PI control link of the inner loop current d-axis controller, dimensionless; w is the rotation angular velocity of the dq coordinate system, and L is the inductance of each pole of the converter station. Among them, the parameters such as kp1 and ki1 of the two-pole converter remain consistent.

[0057] The q-axis control link of the inner loop current controller is decoupled and controlled. Based on the q-axis component of the actual value of the AC bus voltage, the q-axis component and the d-axis component of the AC current flowing into the sending-end converter, the q-axis component of the converter voltage command value is obtained. The calculation formula is as follows:

[0058]

[0059] Among them, v q It represents the q-axis component of the converter voltage command value, in kV; kp2 represents the proportional coefficient of the PI control link of the inner loop current d-axis controller, and ki2 represents the integral coefficient of the PI control link of the inner loop current q-axis controller, dimensionless. Among them, the parameters such as kp2 and ki2 of the two-pole converter remain consistent.

[0060] The three-phase voltage command value of the converter is obtained by using the d-axis component and the q-axis component of the converter voltage command value through Park inverse transformation. The calculation formula is as follows:

[0061]

[0062] Among them, v a 、v b 、v c They represent the voltage command values ​​of phase a, phase b, and phase c of the converter, respectively, in kV; θ is the phase angle of the converter.

[0063] Take the example of a new energy station with an output power of 1470MW, pole 1 and pole 2 connected to only one converter, and the active power is 735MW respectively. Figure 5As shown, when the active power demand of the receiving-end power connected to the receiving-end converter is inconsistent and the active power demand of the receiving-end power grid connected to the pole 1 converter is 600MW, pole 1 is set as the dominant pole, triggering the bipolar coordinated control enable, and the operator sets the active power command value of the dominant pole Pole 1 to 600MW. The pole 1 controller calculates the three-phase voltage command value of the converter according to the bipolar converter control method of the present invention, so that the active power of pole 1 is adjusted from 735MW to the active power command value of 600MW at a certain rate, and the active power of the non-dominant pole Pole 2 is adaptively adjusted from 735MW to 870MW at the same rate. When the active power demand of the receiving power grid connected to the pole 1 converter is 1000MW, the active power of pole 1 is adjusted from 600MW to the active power command value of 1000MW at a certain rate, and the active power of the non-dominant pole 2 is adaptively adjusted from 870MW to 470MW at the same rate, so as to realize the on-demand allocation of the active power of the two-pole converters at the sending end according to the active power demand of the receiving power grid 1 and the receiving power grid 2, improve the flexible configuration of the active power of new energy, avoid the emergency operation of new energy stations, and improve the effective utilization rate of new energy.

[0064] Device Embodiment

[0065] A sending-end bipolar converter control device of the present invention includes a processor, and the processor is used to control the sending-end converter according to a sending-end bipolar converter control method introduced in the above method embodiment. The specific implementation process of the method has been described in detail in the method embodiment and will not be repeated here. As a preferred embodiment, optical fiber communication is used between converter control devices to exchange information. For example, fast optical fiber communication is used between each converter control device to transmit the actual value of reactive power to each other, and the communication protocol can adopt IEC 60044-8, IEEE 802.3 1000Base, Aurora, etc., and the transmission rate is at least 20Mbps.

[0066] Computer Readable Storage Medium Embodiments

[0067] A computer-readable storage medium of the present invention stores computer executable instructions in the storage medium. The computer executable instructions are used to implement a sending-end bipolar converter control method when executed. The specific implementation process of the method has been described in detail in the method embodiment and will not be repeated here.

Claims

1. A sending-end bipolar converter control method, characterized in that: include: The frequency difference of the control system is obtained according to the active power command value of the converter and the actual value of the AC active power of the converter, and the phase angle of the converter is calculated based on the frequency difference and the reference frequency; wherein, when the active power demands of the receiving-end power grids to which the converters at the two poles of the receiving end are connected are inconsistent and only one pole of the receiving-end power grid has a clear active power demand, the sending-end converter at the pole where the receiving-end converter connected to the receiving-end power grid with a clear active power demand is located adopts PI control to calculate the frequency difference, and the sending-end converter at the other pole adopts active power-AC frequency droop control to calculate the frequency difference; The three-phase voltage command value of the sending-end converter is calculated according to the d-axis component current command value, the q-axis component current command value and the phase angle of the converter, and the sending-end converter is controlled according to the three-phase voltage command value of the converter.

2. The sending-end bipolar converter control method according to claim 1, characterized in that: When the active power requirements of the receiving-end power grids to which the converters at the two poles of the receiving end are connected are consistent, the converters at the two poles of the sending end both use active power-AC frequency droop control to calculate the frequency difference.

3. The sending-end bipolar converter control method according to claim 1 or 2, characterized in that: The switching control method is used to control the converter at each sending end using PI control or active power-AC frequency droop control to calculate the frequency difference.

4. The sending-end bipolar converter control method according to claim 1, characterized in that: The method for generating the d-axis component current command value is as follows: first, the reactive power differential adjustment amount of the converter is calculated according to the difference in actual reactive power values ​​between the converter and other converters connected in parallel with the same pole in the sending-end converter station and the difference in actual reactive power values ​​between the two poles in the sending-end converter station; then, the reactive power differential adjustment amount is superimposed on the AC bus voltage command value and the d-axis component of the actual value of the AC bus voltage is subtracted; then, the output value of the difference between the converter reactive power command value and the actual reactive power value after reactive power droop control is superimposed; and then the d-axis component current command value is obtained through PI control.

5. The sending-end bipolar converter control method according to claim 4, characterized in that: The method for calculating the reactive power differential regulation amount of the converter is as follows: according to the difference in actual reactive power values ​​between the two poles in the converter station where the converter is located and the number of converters in the pole where the converter is located, the first regulation amount evenly distributed for the converter is calculated; the sum of the differences in actual reactive power values ​​between the converter and other converters connected in parallel to the same pole is calculated as the second regulation amount; the first regulation amount and the second regulation amount are superimposed to obtain the reactive power difference of the converter; and the reactive power differential regulation amount of the converter is obtained according to the reactive power difference of the converter and the reactive power differential regulation coefficient.

6. The sending-end bipolar converter control method according to claim 5, characterized in that: The calculation formula of the reactive power differential regulation of this converter is: Among them, ΔQ is the reactive power differential regulation of this converter, k0 is the reactive power differential regulation coefficient, m is the number of converters in the pole where this converter is located, n is the number of converters in another pole, Q i is the actual reactive power value of the ith converter in the pole where the converter is located, Q opj is the actual reactive power value of the jth converter in the other pole, q i is the difference in actual reactive power between this converter and the other i-th converter connected in parallel with the same pole.

7. A sending-end bipolar converter control device, comprising a processor, characterized in that: The processor is used to execute computer instructions to control the sending-end converter according to the sending-end bipolar converter control method according to any one of claims 1-6.

8. The sending-end bipolar converter control device according to claim 7, characterized in that: The inverter control devices use optical fiber communication to transmit information to each other.

9. A computer-readable storage medium storing computer-executable instructions, characterized in that: The computer executable instructions are used to implement the sending-end bipolar converter control method according to any one of claims 1 to 6 when executed.

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